Trivia: Unknown at the time, two future Star Trek references are made in this film. The director, Robert Wise, would go on to direct Star Trek: The Motion Picture, and at the end of the film when discussing the cloud seeding, a caption on the video monitor reads out "Nimbus 3". This was the name of the planet on which Sybok takes prisoners in Star Trek V: The Final Frontier.
Trivia: In 1957 folk-singer Ewan MacColl wrote "The First Time Ever I Saw Your Face." In 1969 Roberta Flack recorded this. In 1971 Clint Eastwood was driving through Los Angeles when he happened to hear the record on his car radio. Eastwood so liked it that he included it in Play Misty For Me. Cinema audiences picked up on it, and it became the best selling US record of 1972, turning Roberta Flack into an international star. However, Ewan MacColl said he always hated Flack's version of his song.